We have built a test server and restored our production 4.5.6 NE backups to this test server.

We now want to test doing an in-place upgrade of Zimbra 4.5.6 to 5.0.

But we have 4.5.6 NE, and there is only 5.0 b3 OSS.

Before we try this, is this a valid test case?

Thanks,
Mark