When attaching files to a message you can attach files up to 4.29 MB.
The below file types cannot be attached to messages:
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.ade .adp .asa .ashx .asmx .asp .bas .bat .cdx .cer .chm .class .cmd .cnt .com .config .cpl .crt .csh .der
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.dll .exe .fxp .gadget .grp .hlp .hpj .hta .htr .htw .ida .idc .idq .ins .isp .its .jse .json .ksh
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.lnk .mad .maf .mag .mam .maq .mar mas .mat .mau .mav .maw .mcf .mda .mdb .mde .mdt .mdw
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.mdz .ms-one-sub .msc .msh .msh1 .msh1xml .msh2 .msh2xml .mshxml .msi .msp .mst .ops .pcd .pif .pl
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.prf .prg .printer .ps1 .ps1xml .ps2 .ps2xml .psc1 .psc2 .pst .reg .rem .scf .scr .sct .shb
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.shs .shtm .shtml .soap .stm .svc .url .vb .vbe .vbs .vsix .ws .wsc .wsf .wsh .xamlx
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