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Dominoes migration gotchas and need2know's: 4.6 - 6.5

I need to be able to prepare some questions and bring up crucial points that an enterprise wide upgrade to Dominos 6.5 will present to the office I work at.

The entire organization has about 2000 people and about 12 offices with a mixed 4.6x/5.x dominoes environment.
The office I work at has 100 people with a 4.6a Dominoes server running on NT4.  
The new Dominos 6.5 system will go on an entirely new server with Windows 2003 as the OS.

Any hard lessons learned would be much appreciated here.

Example problems/issues might include (but not be limited too) the migration of user accounts, external resource access changes, new certifiers for OU’s, special tools, etc.

I'm also concerned that those managing the project have not dealt with dominoes 4.6 in some years, and may overlook something crucial during the migration.  (anything to avoid massive re-do's)

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Marketing_Insists
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Marketing_Insists
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qwaleteeCommented:
Well, if you have any 4.6 SMTP infrastructure, the settings for BOTH R5 and R6 are different.

Also, you must make sure that you don't end up with a "large UNK" on your 4.6 servers, or they will go bust on your Domino directory.  Several ways...
a) upgrade all the 4.6 boxes to 5 before loosing 6 anywhere
b) upgrade all 4.6 boxes to 6 as your first step, so there are no 4.6 servers concurrent with 6 being out there
c) upgrade all 4.6 boxes to the last maintenance release, I think it 4.6.7a, which supports large UNKs (it was done just for your situation)
d) stop replicating your Directory to your 4.6 servers before loosing 6 in the environment
e) use selective replication to prevent bringing in design and prevent bringing in any Policy docs; I think it was all the fields on the policy form/policy docs that blew out the UNK

Avoid early releases of 6.  Use 6.0.3 or 6.5.0.  I've heard some mixed things about 6.5.1.
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Marketing_InsistsAuthor Commented:
Thank you, the UNK issue would be paramount.

Also found some war stories here: (though regarding 6.0 )
http://www-10.lotus.com/ldd/today.nsf/0/abfdffa522fc5ba900256c410045c95b?OpenDocument
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