4.5/4.6 clients on R5 Server

We're planning to upgrade this month and we want to do the servers first. Will clients 4.5 and 4.6 will work after we upgrade the server to R5? any upgrade TIPS from 4.5 server to R5?
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Upgrading the servers first is the recommended upgrade path (per Lotus).  The 4x clients will continue to connect to the server, will access databases, will route mail, etc.

The only areas I would mention:
1) The public address book (directory) has been greatly redesigned.  The most recent releases of R5 have included backward compatible 'Person' and 'Group' documents (special versions just for pre-R5 clients).  The other documents (such as server, connection, domain docs, etc.) do not have R4-compatible versions.  For the most part your users rarely have reason to explore documents beyond the person and group forms -- but know that they will appear 'ugly' if they try.

2) Some of my upgrades, especially those with customized public address books, have experienced trouble with type-ahead name resolving.  This was a frequent problems with the early releases of R5 ... less frequently seen with the more recent releases (5.02+).  I suggest upgrading the user's mail server last if possible (begin with special use servers such as replication hub servers, SMTP servers, moving towards those that host user mail files last).  

3) be sure to NOT upgrade user mail files until the clients have been upgraded.

Good luck!

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I would go to the litus sight. There are a LOT of books/material on how to upgrade from 4.x to 5. You should go thru this and carefully plan the upgrade. It is not something to do without the planning stage. One mistake could cost you your job.

There should not be any major problems if you do not upgrade your mail template.

You might consider to rename all your
database from *.nsf *.ns4 and unload the design task so it doesn't upgrade
your databases.

Once all your servers are upgraded then you can convert your databases to R5.

Also, read the Admin manual and the upgrade manual/NSF before you start.

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