error 0x80190194 in Outlook

when i open outlook sen my account that have a eroor 0x80190194

10:25:16              0X80190194

i some page answer

1) Under Default Web Site in IIS, click on OAB
2) If Win2003(IIS 6) go to properties and HTTP headers,if Win2008(IIS7) open the HTTP headers option.
3) Here click on Mime types and check whether we have the LZX format listed.
4) If yes you can ignore the steps, if not present then we need to create the new extension for LZX.
5) Extension: .lzx
    MIME TYPE: application/octet-stream
6) Perform IISRESET

i have server 2008 but  not see HTTP headers option

please help me