Prefix:
I’ve been managing my contacts list, for ever – it seems, or at least since I managed to create one, and save it in a certain form.
And been thinking whether to put some effort into creating an application for the process of Syncing/Merging duplication etc’.

Online market status:
The online market got, already, plenty of tools in which each app offer certain kind of functions (more or less).
Yet, having the ability to manage that from a delphi source code — could be found useful in many cases.

Present situation as It seems to me:
At present the default desktop apps, offer an import/export procedure.
Yet, for example, it doesn’t always manage the binary pictures properly,. Or does in a faulty way the process of merging.

Various software contact structures:
1. Ms outlook
2. Ms outlook express
3. Ms Windows contacts .CONTACT
4. Apple iOS/OSX contact structure
5. Incredimail contacts
6. Csv plain structure
7. .VCF structure

Various Web contact structures:
1. Ms live outlook
2. FaceBook contacts
3. Google gmail (including android apps for that)
4. Google gplus contacts (including android apps for that)
5. Yahoo email