I've noticed I'm getting a bunch of these errors everyday, to the tune of over 500 per host:

2012-11-16 15:54:10,586 WARN [btpool0-93://<hostname>service/soap/GetMsgRequest] [name=<user>@<domain>;mid=479;ip=172.20.21.32;ua=Zi mbraWebClient - FF3.0 (Win)/7.1.3_GA_3346;] gal - GalGroup - group cache has reached maxsize of 10 domains, group indicator for messages are temporiry unavailable for domain <domain>

I removed replaced the user names and such, but they happen for random users in random domains.

Any idea what these mean?