Recommended Mailbox Maximum Size and Email Attachment Policies

Does anyone have some advice for me as to what I should set as the maximum mailbox size for Exchange 2000? I had one mailbox recently for a manager weigh in at 2.5GB. I have about 40 email users and I want to keep the nightly backups at a manageable size. Is there a mailbox size that starts to negatively affect perfomance of that users account?

Also, what would you recommend I set as my email attachment policy? Currently, I'm blocking .scr, .pif, .vbs, .eml, .cpl, .com, and .chm. I'm thinking I'd like to add .exe to that block list. Zip files frequently have viruses but I know my users get those from time to time and I don't want to inconvenience them or discourage them from asking for compressed attachments. I'm using Vamsoft's ORF SPAM filter to drop emails containing the aforementioned attachments. My options with that program are to drop the email or let the email through and replace the attachment with a text file explaining that the attachment is not allowed. Any advice? Tips?

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I would definately block .exe files from your e-mail.  What version of Outlook are you running?  The newer ones automatically block those files.  Once you've opened up users to have free reign on saving any and all e-mails, it's hard to get them to "clean up" their mailboxes.  As far as performance, it depends on what you  have for hardware (disk space, memory) and what version of Exchange you have.  If you have Standard, you may run into a problem of running out of db space.  I would ask all users (especially the 2.5 GBer) to clean up the mail boxes.  Make sure they understand that the deleted items, and sent items need to be entered.  Another thing is that if you users recieve attachments, save them and keep them on thier e-mail, you've got that attachment saved twice.  As far as what you should set your parameters, I'd say that's all up to your system, what you need, what you have.

Here's a list of what Outlook 2002 automatically blocks as far as attachments.

.ade Microsoft Access project extension
.adp Microsoft Access project
.bas Microsoft Visual Basic class module
.bat Batch file
.chm Compiled HTML Help file
.cmd Microsoft Windows NT Command Script
.com Microsoft MS-DOS program
.cpl Control Panel extension
.crt Security certificate
.exe Program
.hlp Help file
.hta HTML program  
.inf Setup  Information
.ins Internet Naming Service
.isp Internet Communication settings
.js JScript file
.jse Jscript Encoded Script file
.lnk Shortcut
.mda Microsoft Access add-in program
.mdb Microsoft Access program
.mde Microsoft Access MDE database
.mdz Microsoft Access wizard program
.msc Microsoft Common Console Document
.msi Microsoft Windows Installer package
.msp Windows Installer patch
.mst Visual Test source files
.pcd Photo CD image or Microsoft Visual Test compiled script
.pif Shortcut to MS-DOS program
.reg Registration entries
.scr Screen saver
.sct Windows Script Component
.shs Shell Scrap Object
.url Internet shortcut
.vb VBScript file
.vbe VBScript Encoded Script file
.vbs VBScript file
.wsc Windows Script Component
.wsf Windows Script file
.wsh Windows Script Host Settings file

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I set everyone to 200MB and make them move old emails to a .pst file, since the .pst can grow to about 4gb they can dump all they want to it.

Getting the 2.5 gb email off the exchange server and into a .pst (that is backed up of course) will be better for everyone.

As mentioned above I block all those and more at the Exchange server using GFI MailEssentials. The ONLY 4 things I let through are .doc,.xls,.mdb and .ppt and those 4 are all scanned twice for virus\imbedded code. The rest are stripped and help in a quarentine folder that I can pull manually in case someone needs them.
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