[WHOOPS!: Duplicate of http://jira.atlassian.com/browse/CONF-5374]

Confluence []-syntax and the linking plugin do not support all valid URI:s. For example, these are samples from the RFC:

1.3. Example URI

The following examples illustrate URI that are in common use.

ftp://ftp.is.co.za/rfc/rfc1808.txt
– ftp scheme for File Transfer Protocol services

gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles
– gopher scheme for Gopher and Gopher+ Protocol services

http://www.math.uio.no/faq/compression-faq/part1.html
– http scheme for Hypertext Transfer Protocol services

mduerst@ifi.unizh.ch
– mailto scheme for electronic mail addresses

news:comp.infosystems.www.servers.unix
– news scheme for USENET news groups and articles

telnet://melvyl.ucop.edu/
– telnet scheme for interactive services via the TELNET Protocol

Of these all except the news-variant is supported. In my current situation I would have needed that syntax to work. (We got a client software for CRM-tasks and we need to link to it with links like limecrm:project.Lime IT.reslim01?9401 which currently won't work.) We had to active the html-macro as a workaround.