Each mailbox can use up to 49.5 GB of space on the server. The system performs a check at 2am each day and sends a message to any mailboxes that exceed one of the following limits at that time.
- 49 GB warning
- 49.5 GB prohibit send
- 50 GB prohibit send and receive
The limits are set to make you aware that your mailbox is becoming too large, before you are unable to receive messages.
If your mailbox size exceeds one of the limits after the check at 2am is performed, you will not receive a warning message, but you may be unable to send or receive emails until you reduce your mailbox size.
Messages cannot be sent or received if they exceed 40 MB.
If you need to send large files, try compressing them by saving them in a .zip file before attaching them to the message.
In Windows you can zip files by right clicking on them in My Computer and then, under Send To, clicking Compressed (zipped) folder.
Outlook prevents the following potentially dangerous attachments from being opened.
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.ade
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.adp
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.app
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.asp
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.bas
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.bat
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.cer
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.chm
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.cmd
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.cnt
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.com
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.cpl
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.crt
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.csh
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.der
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.exe
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.fxp
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.gadget
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.hlp
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.hpj
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.hta
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.inf
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.ins
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.isp
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.its
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.js
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.jse
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.ksh
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.lnk
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.mad
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.maf
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.mag
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.mam
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.maq
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.mar
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.mas
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.mat
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.mau
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.mav
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.maw
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.mda
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.mdb
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.mde
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.mdt
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.mdw
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.mdz
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.msc
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.msh
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.msh1
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.msh2
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.mshxml
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.msh1xml
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.msh2xml
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.msi
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.msp
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.mst
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.ops
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.osd
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.pcd
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.pif
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.plg
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.prf
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.prg
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.pst
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.reg
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.scf
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.scr
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.sct
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.shb
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.shs
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.ps1
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.ps1xml
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.ps2
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.ps2xml
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.psc1
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.psc2
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.tmp
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.url
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.vb
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.vbe
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.vbp
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.vbs
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.vsmacros
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.vsw
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.ws
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.wsc
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.wsf
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.wsh
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.xnk
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In addition to this, messages sent to, or received from, external addresses that contain any of these attachments will be quarantined.
It is recommended that you do not send these types of files by email. In situations where this is unavoidable, files can be renamed with the extension removed to allow delivery. The recipient will have to rename the file with the extension to open it.
