On 4/15/2011 3:46 PM, Florin Andrei wrote: > On 04/15/2011 12:30 PM, Jeff wrote: >> By default Thunderbird creates a local cache for IMAP accounts -- for >> large accounts, this can be problematic. Have you tried disabling the >> local synchronization? >> >> Account Settings -> Synch& Storage -> Uncheck "Keep messages for this >> account on this computer" > It's unchecked already. > I experienced a similar problem with Thunderbird on Windows. For me, it ended up being folder compaction. Changing the settings on compaction (Tools/Options/Advanced/Network & Disk Space) reduced the frequency that folders are compacted, and thereby my frustration, but did not eliminate them. I agree that the UI should not be affected by maintenance functions. Hope this helps. Michael Davis Profician Corporation