IMAP server using linux to fetch emails for exchange server

we have an exchnage server standard edition 2003 and planning to implement roaming user profiles for around 30 user .But since the  storage  limitation of the standard edition we can only use pop3 for most of the users .  this may lead to pst curruption .My question is is there any way to install a IMAP server using linux to fetch emails to and fro from the client and routed via my exchnage server?
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sumeshbnrAsked:
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linrafConnect With a Mentor Commented:
With 30 users, I would think that the exchange 2003 sp2  limit of 75Gig should be manageable.
I have no experience with linux, so if you want to continue down that path, I will defer to linux gurus.

Otherwise here is a Microsoft article of how to raise to limit ( max of 75 gig) on Exchange 2003 sp2.
http://support.microsoft.com/kb/912375/

If 75gig is truly too small for your 30 users, then i would suggest looking at archiving software/appliances to allow your users the freedom to delete their old email without compliance or historical issues.
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sukamtoCommented:
yes, you can setup linux Postfix mail server with IMAP protocol, then setup fetch job to pooling pop3 email from you exchange and store locally on Postfix server, then your users will connect to Postfix server instead of exchange.
But by doing so, you exchange server will be meaningless and i think 30 users on exchange STD is still enought. I dont see the point of your request.
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sumeshbnrAuthor Commented:
we have around 150 users including this 30 roaming users .how can we integrate with postfix and exchange
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sukamtoCommented:
sorry, not really understand what you want to.
what is your target and reason for that?
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sumeshbnrAuthor Commented:
exchnage is astandard editiona sp2 and only have 75GB limit we currently have 60GB .So this 30 users (romaing pfolfile users) reciveing around 300emails per day basis per user .So we need to have upgrade the exchnage std to enter prise .Thats is pricy now.Can we have a IMAP or exchnage server for this 30 user under linux? we are using a relay provider to rely our external mails in exchange .Please advice.
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sukamtoCommented:
you can setup linux imap server to specially provide email access and they can receiving email from internal and external, but they will having problem to send email to internal users (other 150 users). this can be fixed but will very complex because you only want to host some of the users, not all email users.

instead of using linux imap server, better way to create new mailbox database specially for these account? here the way,
- create new mailbox database
- move mailbox of these 30 mobile users to new mailbox database
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sumeshbnrAuthor Commented:
instead of using linux imap server, better way to create new mailbox database specially for these account? here the way,
- create new mailbox database
- move mailbox of these 30 mobile users to new mailbox database

is it possible in exchnage server 2003  standard edition ?
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sumeshbnrAuthor Commented:
what  about  using hmailserver?
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sukamtoCommented:
yes, should be, try it out. but before that, make sure you make full backup and try creating 1 test account and fill it with many big size email, and test with this new test account instead of try on live 30 users.
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sukamtoCommented:
or if you want to complete change your email infrastructure ( not using exchange at all ), you can consider linux solution, ZIMBRA mail server, very good. try googling it for more info.
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sukamtoCommented:
hmailserver? it is not what mailserver you want to install, the problem is still the same, your 30 users will able to send external mail, but how to send internal mail which is in exchange, not in new mail server? because mailserver policy, they wont relay internal mail to outside. you got my point?
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sumeshbnrAuthor Commented:
yes


As a last resort  what you suggest?
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sukamtoCommented:
what kind of mail account your users ( 150 normal users and 30 mobile users) using? exchange accoutn, pop3, imap or exchange account?
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sumeshbnrAuthor Commented:
50 Exchange  100 pop 30 still exchnage but need to decide
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sukamtoCommented:
better use pop3 account for all users, in pop3 account you can set "keep email in server and remove email after xx days", this way your database wont full. or you can use exchange account, but store mail to local hdd (ms outlook PST file) instead of in Server MAILBOX, also wont fill up your database in this way.
you use exchange account if your users need to access email with many device ( Global address book, OWA, office PC, home PC, net cafe PC, etc) which require server to keep all inbox, sent item, draft mail, calender. my way, only set exchange account for VIP.
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sumeshbnrAuthor Commented:
this way your database wont full. or you can use exchange account, but store mail to local hdd (ms outlook PST file) instead of in Server MAILBOX, also wont fill up your database in this way.---- did you mean cached exchnage mode?
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sukamtoConnect With a Mentor Commented:
No, when you create exchange account in Ms Outlook, email delivery storage will default to Exchange mail server mailbox (in server), cached mode is your outlook create 1 chace of the mailbox account while the exact mailbox still store on exchange server. what i was refer to is, after you create exchange account in ms outlook, goto Tools-Email account-View or change email accounts-next-New Outlook Data File-browse to location of your local hdd where to save this outlook data file (pst). Then in "Deliver new email to the following locations: " select your newly create Data file then click Finish, then restart your Ms Outlook. On next start of MS Outlook, outlook will download all Inbox mails (not other folder) to local harddisk (new created pst outlook data file)
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sumeshbnrAuthor Commented:
what is the difference between POP3 and this kind of configuration?
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sukamtoCommented:
this configuration you still using exchange account, so can have GAL (global address list), also can access to public folder.
pop3 you wont have GAL, must create own address book.
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sumeshbnrAuthor Commented:
I am waiting some to comment on this
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vedant0500Commented:
Check this I think this should resolve your concern

http://www.saunalahti.fi/juhrauti/index.html

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