Remember The Milk Provider Extension For Thunderbird. [Thunderbird Gyan]

by Anoop Engineer 67 comments

Thunderbird fans using Remember The Milk, gets another reason to cheer. The popular task manager and GTD application - Remember The Milk now has a provider plugin to sync with Thunderbird.

A good guy named Micheal Wu made an extension, which works along with Lightning extension to bring RTM to your Thunderbird. Using this extension, you get bi-directional access to your RTM tasks. You can add tasks, delete them, modify them and set their priorities, right from Thunderbird.

  1. Install the Lightning extension for Thunderbird, if you haven't installed that already.
  2. Download Remember the Milk Provider extension and install it.
  3. Restart Thunderbird.
  4. Go to Calendar view (Ctrl + 3) and select File -> New -> Calendar.
  5. Select "On the Network" and hit Next.

  6. Select Remember the Milk Provider. You don't have to care about the Location text field. Click Next.

  7. Give a suitable Name for the Calendar. Your RTM to-do list will appear as events in this calendar.
  8. Now, you will see that a new task has been added to your task list in Thunderbird's main screen, which reads "Please Authenticate RTM. Open me to see how". Double click on this event. There will be an address in the description of this event. Go to this address using your web browser and you will see this screen.

  9. Click on "OK, I'll Allow it". Now come back to Thunderbird's task list and mark the "Please Authenticate RTM..." event as completed.
  10. That's it. If everything went as expected, you'll see a message box saying you are authenticated and your RTM tasks will appear immediately in Thunderbirds task pane.

You can add, delete, modify these tasks from Thunderbird itself. To find out what more you can do with this little extension, watch this video that the extension author himself have made.

Do tell us what you think about this addon in the comments. Once again, thanks to Micheal Wu.

Remember the Milk Provider extension.

Comments 67 comments
Ajay said...

Good gyan.

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Danomite said...

This addin works great, except that the due dates are not syncing, which happens to be a rather significant caveat to me.

adam said...

the add-in works, but leaving a few core RTM features to be desired:
- dates (as @danomite already mentioned) in Tasks aren't syncing
- calendar doesn't sync (can't see any of my tasks in Lightning)
- can't see which list a task is associated with

A great start though - looking forward to the next release!

Mike said...

Thanks everyone, and especially for this post, I've linked it since it should be very helpful for ppl instead of the readme.

For the dates, I'm currently looking into it.
For the calendar, I don't think regular tasks show in the lightning calendar do they?
RTM List/tbird Categories aren't yet supported, sorry.

Thanks! Time isn't something I have a lot of (see http://rtm.tbird.mwu.googlepages.com) but I'll do my best!

Mike said...

new version out, due date version addresses! check https://addons.mozilla.org/en-US/thunderbird/addon/7125

Marc said...

Hi Mike, thanks für this very useful add-on. Unfortunately the due date isn´t correctly recognized (version 0.05). I can set the due date in lightning, but it isn´t saved if the rtm calendar is chosen.

The other way (rtm->lightning) works fine!

פיצה said...

For me not all the tasks are shown, and all of what is shown is one day earlier than what I have on rtm :(

starweaver said...

Mike is there something I am missing - I have multiple task lists and everything is brought into thunderbird without that information, which is very important to me as I keep task lists based on projects

Anonymous said...

I'm curious if *some* day/time issues have to do with timezone consistency between your OS and RTM? Though I'm not sure.

Unfortunately starweaver that is not implemented yet, however when I have more time for the project it is something feasible.


Anonymous said...

I tried to install and got this message

any help?


Uh oh... something went wrong. Don't worry though; it's not your fault. The application you're using to interact with Remember The Milk made an error. It might be worthwhile contacting the author of the application and telling them you encountered this page.

Alternatively, you might like to wait a little while and then try again.

Colby said...

I installed on T-Bird on Linux.
(I also have Provider for Google Calendar
installed, if it matters.)
Rebooted as instructed.

I added the calendar as instructed,
but I never got the task on the main
T-bird panel that says,
"Please Authenticate RTM. Open me to see how".."


Thor said...

Hi Mike

I have same setup and same problem as Colby. Any ideas are welcome!

Colby said...

I found the solution - RTM was temporarily down. It's working now. Now, time to experiment with it...

ceci said...

great add-on! it's a lifesaver. for your next round of updates, it would be great if rtm lists match-up/sync with thunderbird add-on categories.

Thor said...

@Colby Mine's working now also

Anonymous said...

Same problem as @Colby was having.. Maybe the site's down again? Interested to test this out!

Anonymous said...

still not working today! (Waiting for the first task to show up after adding the calendar) :(

Stephen said...

I am having this same issue today. Looks like a great add on though!

Cichy said...

OK, it downloaded my task list from RtM, but it doesn't work - if I add a task in TB, it doesn't show in RtM online. And I can't finish my tasks in TB:( So - this plugin maybe is cool idea, but sucks when used. Any ideas WHY it's impossible for me to communicate with RtM and finish my tasks?

Anonymous said...

Remember The Milk API issue
Uh oh... something went wrong. Don't worry though; it's not your fault. The application you're using to interact with Remember The Milk made an error. It might be worthwhile contacting the author of the application and telling them you encountered this page.


Anonymous said...

Those following this discussion might find this link of help:


Mike Wu said...

Hey all, I'm aware of the editing tasks issue and it's due to 503 errors I'm getting from the API server. I'm currently investigating why.

For the authentication fails ("Uh oh... something went wrong....") I can only suggest trying again, I haven't been able to reproduce the error myself.

Also adding logging and multiple installation features.


Mike Wu said...

Ok things are fixed, editing works again, authetication works a bit better if you make a mistake, logging and token view/edit is in, which means multiple clients is again possible.


Mike Wu said...

I mean multiple clients is possible (for the first time).

Anonymous said...

The latest update for Lightning breaks this add-on for me. I installed Lightning 0.9 and the the RTM add-on errors out.

Mike Wu said...

Oh some kind users informed me this morning, and v0.0.10 is now out (with Lightning 0.9 compatibility).

Unfortunately auto-update is not enabled while I'm still in experimental status, so a manual update is required.

There is a review process to go through for that, but I'm unsure of the results.

Heath said...
This comment has been removed by the author.
Mike Wu said...

Heath can you email me at tbird.rtm.mwu@gmail.com with more details? Is it Tbird v0.0.11 and Lightning 0.9? Can you tell me how you setup your google calendar into into Tbird so I could attemp to reproduce?

Anonymous said...

I wish that plugin would work offline ...

Mads said...

I get the error: "Could not complete installation :-( Did you allow API access by clicking the "Ok, I allow it"..."

I did do this on the RTM API page! Twice to make sure - still doesn't work for me.

Running THB 2 with Lightning 0.9 (both latest) on Win XP.

Mads - iTeam webdesign said...

Okay, I figured this out. You get this error "Could not complete installation :-( Did you allow API access by clicking the "Ok, I allow it"..."

If you during setup of the RTM extension does not choose to associate the new calendar with an already setup mail account.

Not it seems to work fine - can see tasks in Thunderbird - just needs to see whether tasks actually synchs when I get home.

John Swaringen said...

I'm getting this error message as well.

Could not complete installation :-( Did you allow API access by clicking the "Ok, I allow it"...

I tried what "redid" the installation and made sure I was using an existing email account. Still no luck. I can see the tasks, but can't:

Mark the API task comeplete.
Add New tasks don't get uploaded, but there isn't an error.
Can't see any tasks.

System Info:
Thunderbird - (20080914)
Lightning 0.9
Using an IMAP email.

Anonymous said...

I just installed the RTM provider extension today, by following the instructions as detailed in this post, the setup went flawlessly, but after that the extension doesn't seem to work, I can not use it to import or export task

venkat.arakla said...

I installed today and started entering tasks
in TB. I encountered below issues

1) Start and due date entered in TB shows different due date in RM
2) Time zone shows two different zones in TB
Europe/London & UTC/GMT

Thanks for great work hope issues which we encounter will be fixed in next versions..

Another new user said...

Anonymous October 13, 2008 1:24 AM:

I was having the same problem for 2.5 hours today - everything seemed OK but no syncing. It turned out I had forgotten to click the "completed" check box on the authentication task. Once I clicked that, I got the login message and things started working.

miklb said...

I hope this will be updated to work with Lightning 1.0, currently using 1.0pre with Shredder nightly and I'm assuming the problem is it doesn't recognize the version of Lighting.

Marcus Radisch said...

Hello together,

It works fine :) I had the same Problem. The Problem was the in the Preferences of the Remember The Milk Provider Plugin. The Checkbutton "Logging Enabled" was set. In My installation i set it back(uncheck the Checkbutton) I use Ubuntu TB Lightning 0.9 Remember The Milk

Many greetings

Marcus Radisch

Anonymous said...

I really like this addon but unfortunately the last update was in 09/2008. Is this dead? If so, is there a replacement out there?

David said...

I would love this addon too, but I didn't even get asked about authenticating anything. Just acts as if nothing has changed.

Anonymous said...

I purchase the Pro Version last year and not it's not working correctly. It's not syncing any longer.. I even tried deleting the calendar and adding it again and no luck. It doesn't ask me to authenticate anything. I was running this plugin on three machines and it suddenly just stop working. I don't see my task at all in Thunderbird.

Rich said...

used this extension in the past then drifted away from using Tbird entirely(Gmail+RTM plugin). want to setup on wife's laptop.
have XP sp3,
Lightning 0.9,
Provider for Google calendar 0.5.1,
RTM Provider 0.0.11
after creating new calendar per instructions , fail to get new task to begin Authentication to RTM account. have even gone so far as to create a new Tbird profile, but No task shows up...any suggestions on where to go from here.

Anonymous said...

Don't have the first task either :(

Anonymous said...

For a beta it is a Beta...
Sorry your work doesn't match my thunderbird

Anonymous said...

This was working great for the time being. It stopped working!

slamp said...

Unable to authenticate RTM.
Got the message: "Uh oh... something went wrong. Don't worry though; it's not your fault. The application you're using to interact with Remember The Milk made an error. [...]"

Mike Wu said...

Hi all there was a new version released the other day, 0.0.13 which fixes the non-appearing tasks problem.

The source of the issue has not been resolved YET though so it may occur in the future unfortunately...

-No you dont need Pro RTM.
-Timezones IS still something I have to look at.
-I wish I had time to make offline compatible as well.
-Yes this is sub par work, but I dont get paid for it, unlike my frequently overtime full time job...
-I've actually never considered it even beta, and was surprised as hell when it made lifehacker and this.
-For those of you with kind words, thanks!!

Marcus Radisch said...

Hello together,

RTM is great! And i use Thunderbird with the Plugin. Is there any way or an option how i can add/read Tags in Thunderbird to my Tasks?

Many greetings

Marcus Radisch

Suze said...

Love the add-in.
Might it be possible to have "no start date", show on the Task list/calendar in Thunderbird?

My RTM includes a list of things I want to do someday and they are all showing on the calendar on the day they are entered. Needless to say my list of 100 things I want to do before I die makes for a cluttered Tuesday!
Has anyone developed a work around?

Anonymous said...

Impossible to instal the Remember the Milk extension. Any idea?

Amy Lynn said...

Didnt work at all? not request to authenticate RTM?????

Boo said...

Hi Mike Wu, works fine! Too bad you can not maintain this little glorious add-on.

I agree with Suze: Might it be possible to have "no start date", show on the Task list/calendar in Thunderbird?

Anonymous said...

I'm getting this error message after authenticate RTM.

Could not complete installation :-( Did you allow API access by clicking the "Ok, I allow it"...
I can't see any tasks, mark the API task complete and new tasks don't get uploaded

System Info:
Thunderbird - 3.0.1 (french)
Lightning 1.0b1

discount said...

still not working today! ---------- me tool

Anonymous said...


Must have missed a step :-(

Lightning 0.9

Add on installed OK

When creating the calender I get the error:-

[Exception... "ComponentManager::CreateInstance returned failure code:" nsresult: "0x80570015 (NS_ERROR_XPC_CI_RETURNED_FAILURE)" location: "JS frame :: file:///C:/Users/David/AppData/Roaming/Thunderbird/Profiles/5hywcgky.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/components/calItemModule.js -> file:///C:/Users/David/AppData/Roaming/Thunderbird/Profiles/5hywcgky.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/js/calCalendarManager.js :: cmgr_createCalendar :: line 535" data: no]

Any ideas?

home_worker said...

Hi there,

This is great - thanks! But how can I have the RTM tasks pane displayed on my email page?


Anonymous said...

Hi there,

Similar to Anonymous at
I got error when creating the calendar: -
[Exception... "ComponentManager::CreateInstance returned failure code:" nsresult: "0x80570015 (NS_ERROR_XPC_CI_RETURNED_FAILURE)" location: "JS frame :: file:///usr/lib/thunderbird/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/components/calItemModule.js -> file:///usr/lib/thunderbird/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/js/calCalendarManager.js :: cmgr_createCalendar :: line 542" data: no]

Its error number is 2152333318.

System info:
Thunderbird: (20100317)
Lightning: 0.8 (build 2008090509)
for Ubuntu 8.04.4 LTS.

I really need your help! Thanks.

Anonymous said...

Hey there, same prob as anonymous and anonymous here. Any update obn this issue?

Anonymous said...

Hi again,

I am the Anonymous at

RtM Provider 0.0.14 uses things provided by Lightning 1.0b that does not work with TB 2 series, so I have to use RtM Provider 0.0.13 that works with Lightning 0.8 and 0.9 for TB 2 series.

Anonymous said...

Hi there,

I am the Anonymous at

RtM Provider 0.0.11 and newer use things provided by Lightning 0.9, so I have to use RtM Provider 0.0.10 that works with Lightning 0.8! LoL

Finally, I can add tasks from TB to RtM and can list tasks in RtM on TB, by applying API key changes and null element reference fix to RtM Provider 0.0.10.

I hope this helps someone in the same trouble.

Anonymous said...

I want to use Rtm 0.0.15, but it doesn`t work:
"requires more add-ons"

This my system:
Thunderbird 3.0.4
Lightning 1.0b2pre

Which other Add-Ons needs RtM? Or RtM can`t identify this version of Lightning?

What can I do?

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David Gilroy said...

Should this addon work with TB version on a Mac? When I add a new calendar I get an error saying :-

An error was encountered preparing the calendar located at http://_unused/ for use. It will not be available.

and then I can click OK and get the next screen where I name my Calendar, but the Continue button although active, cannot be clicked.

Anyone any ideas?

Anonymous said...

Thank you for this extension, but en error was encountered like Anonymous...

Francisco Marzoa said...

I'm also facing several problems with last Thunderbird versions.

It seems like this extension has reached a dead end years ago, isn't it?

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