Good news: a DBK file is just a renamed ZIP archive, so you do not need PC Suite or the phone at all.
1
Copy the .dbk file somewhere safe, then rename the copy to .zip.
2
Extract it with Explorer or 7-Zip. Inside look for the contacts data, typically vCard files or a contacts folder with .vcf entries depending on the PC Suite version.
3
If you find one big .vcf, that is a multi contact vCard holding everything. If you find many small ones, select all for the next step.
4
In Outlook: File, Open and Export, Import/Export, Import a VCARD file, and point it at the vcf. Older Outlook versions import only the first contact from a multi contact vcf, in that case drag the vcf onto the Contacts folder instead or split it first.
If the extracted archive holds XML instead of vCards, it is a very old PC Suite backup format. The contact fields are still readable in the XML, so worst case you copy them into a CSV with Name and Phone columns and import that via the same wizard using Comma Separated Values.