Users complain slow when opening own calendar and Free/Busy schedule ?

Hi,
I'm using Exchange Server 2007 SP3 (no CU at all) with the following setup as VMware Virtual Machine:
Mailbox Server role (CCR enabled across two different AD sites, same domain)
PRODMBX1-VM - Production mailbox
DRMBX1-VM - Recovery mailbox
HT-CAS role (IGMP Multicast using Windows NLB)
PRODHTCAS1-VM
PRODHTCAS2-VM
DR-HTCAS1-VM
User connects to the Exchange server using CCR clustername using Outlook 2007 SP3, when the user click on the calendar tab, it works fine, but when checking on other people's calendar it takes more than 3-5 minutes with frozen display most of the times (End
task and Restart Outlook) andsomtimes the baloon pop up comes saying ("Connecting to ExcCluster01.domain.com).
Why is this happening quite so often ?
Any suggestion would be greatly appreciated.
/* Server Support Specialist */

Hi,
According to your description, I understand that the shared calendar can be opened but is synced slowly when opening other user’s calendar. Is it right? If I misunderstand, please feel free to let me know.
Does the issue happen to all users or some specific users? We can open other users’ calendar in OWA to check whether it can work well. As for Outlook users, please make sure the Outlook 2007 users are using Outlook in Exchange Cached mode and configured
correctly as the following settings:
1. Click Account Settings on the File tab.
2. In the Account Settings dialog box, click the Email tab, click to select the Exchange account, and then click
Change.
3. Click More Settings. On the Advanced tab, make sure the
Use Cached Exchange Mode and Download Shared Folders check box have been checked.
4. Finish it and restart Outlook.
Regards,
Winnie Liang
TechNet Community Support

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