Microsoft has made sure that Sharepoint won't work in WINE.
WINE developers cannot make the BITS service and other services that Sharepoint and other programs need.
I tried the Sharepoint 2013 beta under the current WINE, it complains that it is not Windows 2008 R2 even if you set it for Windows 2008 emulation. Microsoft has a way to get past the WINE emulation of Windows versions.
Microsoft does this on purpose as a Linux Server with WINE costs nothing, but the Windows 2008/2012 Server licenses costs thousands per user. Do you really think they will allow Linux/WINE to run their Sharepoint software? It won't even run SQL Server or Exchange Server.
There are no Linux alternatives to Sharepoint yet, Microsoft still has their monopoly for now.
2013 might be the year of The Linux Rebellion for video game players, but not Sharepoint.