In my multi-server setup I have two server that are running 32-bit. One is a LDAP replica and the other a MTA. My current version is:

Release 5.0.23_GA_3242.SLES10_64_20100326203056 SLES10_64 NETWORK edition

I want to convert these two machines to 64-bit before upgrade to version 6.

Any thoughts on how I might do this? The wiki articles all seem to be geared towards everything on one box.