Alert: The folder 'Inbox' cannot be compacted because another operation is in progress. Please try again later.
Currently using Thunderbird 52.1.1 (32-bit) but I've had this issue for many years on earlier releases as well. I've read through the Compacting folders page to get more insight in the process and caveats. Still, what bothers me the most is that I cannot explain the root cause.
Some facts:
- IMAP account
- Fairly large Inbox, +- 5000 msg (660MB)
- Large number of message filters on the Inbox, +- 600
The issue does not always occur and I have not been able to identify the exact steps to reproduce. For some time I've kept the Activity Manager open so whenever I compact my Inbox, I can initially see NO activity being executed. I've tried several things before, incl. removing the msf files, using the Repair folder option and others. Still the issue always reappears after quite quickly after any such actions.
I'm interested to find the root cause of the alert so I'm looking for advise on how to figure out for starters, what's the other operation that is in progress since the Activity Manager does show any onging activity. Any suggestion on how to debug / troubleshoot TB for this issue?