Many users(including myself) are having problems with Zimbra 4.5.7(Network Edition). Problem occurs when starting Thunderbird(depending on machine) 1-4 minutes thunderbird is slow and unusable. Same problem occurs when reloading remote calendar.
Same case with Sunbird(High CPU usage, Memory usage about 300-400MB)
Tried 4.5.6 everything works fine(Free edition).
Both systems run on Centos5.
When this slowness occurs server load is about 1-4%.
Outlook connectors (on 4.5.7 NE) are working fine.
Any help would be appreciated.