Hi, I have extensive experience in Access within the investment banking industry and I also have two postgraduate qualifications so your project will be straightforward to implement.
With respect to converting to 2013: I can review your entire database (tables, queries, forms, reports, VBA modules, and the interaction between each) to verify it's integrity. Any conversion errors will be very transparent and straightforward to fix, resulting in a 100% stable database.
I can also update the user interface to expand its user base in keeping with attributes such as aesthetics, being intuitive, and being user friendly. I actually specialise in making Access databases first class Windows applications so they're robust and easy and pleasant to use. Please see the portfolio section of my profile (accessible by clicking the Systems3000 link) for examples and reviews.
I've very recently helped a telecoms company setup their database to be used by multiple users (acquisitions, sales, technician/restoration), on their local network. I also added functionality to their database to track customer details and export filtered and formatted data (e.g. all sales records in the current month) to Excel. These aspects fit in with your requirements very well.
None of the above is difficult to achieve, hence my relatively low bid, and you will have a product that mimics your business processes precisely. Please let me know if I can be of assistance.