I am an Ubuntu 15.10 and Thunderbird 38.5.1 user. I connect to my employer's Outlook/Office 365 servers via IMAP and SMTP.
This morning (20 January 2016), right after receiving a set of updates to some of the installed packages, my Thunderbird client lost all the subscribed IMAP folders (except Inbox and Deleted). Furthermore, even though I can see my folders in the "Subscribe" dialogue window, I cannot seem to resubscribe to them by just ticking folders and hitting "OK". Nothing happens when I do that. When I check again, no folder is subscribed to. I can still receive and send emails, even though I cannot copy messages into my Sent folder, which normally used to happen automatically.
As a workaround, unticking "Show only subscribed folders" in Server Settings > Advanced shows all folders on the IMAP server (after a restart), subscribed or not, which is not quite desirable as many unwanted folders pollute the folders list.
This happened to me on two separate machines running Ubuntu 15.10.
I cannot immediately spot a connection between the updated packages and the problem I described, but I am including the list of the updated packaged below in case it helps. There was also a Thunderbird update six days ago (14 January), but it has been working fine until the updates this morning.
Please let me whether I can provide any further information to diagnose the problem. Or, if you have any suggestions for me...
Thanks,
Tugkan
linux-image-generic (4.2.0.25.27) ...
linux-headers-4.2.0-25 (4.2.0-25.30) ...
linux-headers-4.2.0-25-generic (4.2.0-25.30) ...
linux-headers-generic (4.2.0.25.27) ...
linux-generic (4.2.0.25.27) ...
libisc-export95 (1:9.9.5.dfsg-11ubuntu1.2) ...
libdns-export100 (1:9.9.5.dfsg-11ubuntu1.2) ...
libisccfg-export90 (1:9.9.5.dfsg-11ubuntu1.2) ...
libirs-export91 (1:9.9.5.dfsg-11ubuntu1.2) ...
libxml2:i386 (2.9.2+zdfsg1-4ubuntu0.3) ...
libxml2:amd64 (2.9.2+zdfsg1-4ubuntu0.3) ...
libisc95 (1:9.9.5.dfsg-11ubuntu1.2) ...
libdns100 (1:9.9.5.dfsg-11ubuntu1.2) ...
libisccc90 (1:9.9.5.dfsg-11ubuntu1.2) ...
libisccfg90 (1:9.9.5.dfsg-11ubuntu1.2) ...
libbind9-90 (1:9.9.5.dfsg-11ubuntu1.2) ...
liblwres90 (1:9.9.5.dfsg-11ubuntu1.2) ...
bind9-host (1:9.9.5.dfsg-11ubuntu1.2) ...
dnsutils (1:9.9.5.dfsg-11ubuntu1.2) ...
libavutil-ffmpeg54:amd64 (7:2.7.5-0ubuntu0.15.10.1) ...
libswresample-ffmpeg1:amd64 (7:2.7.5-0ubuntu0.15.10.1) ...
libavcodec-ffmpeg-extra56:amd64 (7:2.7.5-0ubuntu0.15.10.1) ...
libavformat-ffmpeg56:amd64 (7:2.7.5-0ubuntu0.15.10.1) ...
libavresample-ffmpeg2:amd64 (7:2.7.5-0ubuntu0.15.10.1) ...
libpostproc-ffmpeg53:amd64 (7:2.7.5-0ubuntu0.15.10.1) ...
libswscale-ffmpeg3:amd64 (7:2.7.5-0ubuntu0.15.10.1) ...
libavfilter-ffmpeg5:amd64 (7:2.7.5-0ubuntu0.15.10.1) ...
libavdevice-ffmpeg56:amd64 (7:2.7.5-0ubuntu0.15.10.1) ...
ffmpeg (7:2.7.5-0ubuntu0.15.10.1) ...
linux-libc-dev:amd64 (4.2.0-25.30) ...
libav-tools-links (7:2.7.5-0ubuntu0.15.10.1) ...
libavcodec-extra (7:2.7.5-0ubuntu0.15.10.1) ...
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