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• Don't make your user mad.
• Don't make your user lose work.
• Don't make your user change email client.
• Don't make your user change email protocol.
• Don't make your user reconfigure ssh client.
• Don't make your user's email stop working.
• Don't make your user's any application stop working.
• Don't make your user's email become slower than before.
• Don't make your user's any application slower than before.
• Don't make your user's shared folders stop working.
• Don't make your user's printing stop working.
• Don't make your user's email stop printing.
• Don't make your user's mailing lists change the way they work.
• Don't make your user's ssh session timeout change the way they work.
• Don't make your user's daily routines stop working.
• Don't make your user's occational use cases stop working.
• Don't make your user's different login profiles overwrite each other.

Now go ahead and upgrade the network infrastructure.