Outlook 2007, Zimbra 4.5, and XP - possible?

[calciphus]

Hey all,

We've not rolled out Zimbra 5 yet, so I am posting to see if there's any way to accomplish the following:

I have XP
I have Outlook 2007
I have Zimbra Connecter v: ZimbraOlkConnector-4.5.11_GA_1749_4.5.505.msi

Whenever I run the install, I have no problems. However, when Outlook boots, it says the SharingAddin.dll is not compatible, and disables it.

Everything I've read (and I've searched around quite a bit) shows that ZCO 5.x works with 2007, but will 4.5? Or am I stuck with IMAP until we get 5 deployed?